Used Ray-Ban hexagonal flat lenses in polished copper. From Ray-ban site: What do you get when you cross a circle with a square? You get the hexagonal RB 3548N, the evolution of round featuring flat crystal lenses.Round meets flat, when it comes to lenses that is. This hexagonal round metal shape features thin coined profiles and flat crystal lenses on classic gold with extremely thin temples. Mix and match flash base colour options to create the perfect combination. Experience the thrill of wearing an updated classic that will never make you feel like a square peg in a round hole. MODEL CODE RB3548N 9069A5 51-21